SortVersion.cs

namespace System.Globalization
{
    [Serializable]
    public sealed class SortVersion : IEquatable<SortVersion>
    {
        private int m_NlsVersion;

        private Guid m_SortId;

        public int FullVersion => m_NlsVersion;

        public Guid SortId => m_SortId;

        public SortVersion(int fullVersion, Guid sortId)
        {
            m_SortId = sortId;
            m_NlsVersion = fullVersion;
        }

        internal SortVersion(int nlsVersion, int effectiveId, Guid customVersion)
        {
            m_NlsVersion = nlsVersion;
            if (customVersion == Guid.Empty)
            {
                byte[] bytes = BitConverter.GetBytes(effectiveId);
                byte h = (byte)((uint)effectiveId >> 24);
                byte i = (byte)((effectiveId & 0xFF0000) >> 16);
                byte j = (byte)((effectiveId & 0xFF00) >> 8);
                byte k = (byte)(effectiveId & 0xFF);
                customVersion = new Guid(0, 0, 0, 0, 0, 0, 0, h, i, j, k);
            }
            m_SortId = customVersion;
        }

        public override bool Equals(object obj)
        {
            SortVersion sortVersion = obj as SortVersion;
            if (sortVersion != null)
            {
                return Equals(sortVersion);
            }
            return false;
        }

        public bool Equals(SortVersion other)
        {
            if (other == null)
            {
                return false;
            }
            if (m_NlsVersion == other.m_NlsVersion)
            {
                return m_SortId == other.m_SortId;
            }
            return false;
        }

        public override int GetHashCode()
        {
            return (m_NlsVersion * 7) | m_SortId.GetHashCode();
        }

        public static bool operator ==(SortVersion left, SortVersion right)
        {
            return left?.Equals(right) ?? right?.Equals(left) ?? true;
        }

        public static bool operator !=(SortVersion left, SortVersion right)
        {
            return !(left == right);
        }
    }
}